How to render with transparent background in Eevee?
When using 2.79 you can find it on the right side in the properties section, go to render settings, scroll down to the film area and open it. In it, there is a dropdown box called alpha, and currently selected will be sky. Select transparent, and there you go!



In 2.80 the option has been changed to a checkbox and renamed to Transparent as shown in the image below.